That is correct, to unlock your phone it is best to use a code rather than a software. I usually use http://www.unlockphone.codes to unlock my phones. They are fast and reliable. Hope this helps..
... to unlock your ZTE . To get it, visit mobile</b>-unlocker.com/<b>zte</b>/rs2wp8/">Mobile-unlocker.com . Here ... used in Zambia.
You can unlock your phone by visiting a mobile service store and getting a tool ... help you to unlock your phone (this operation voids your warranty ... a small fee to unlock your phone to be able to use ...